Overseaming-machine.



H. J. DAHL. OVERSE-AMING MACHINE.

APPLiCATlDN FILE-D OCT. 6;:1910.

Patented. May 29,1917.

3 SH EETSSHEET 1.

. 4 H. J. DAHL.

OVERS'EAMING MACHINE. APPLICATION FILED ,OCT. 6, 1910.

1 7 75@D Patent-ed May 29, 1917.

3 SHEETSSHEET 2.

Illlllllll L yum 64 H. J DAHL.

OVERSEAMING MACHINE.

APPLICATION FILED OCT. 6. 1910 1 2237 7560 Fatented May 29, 191?.

3 SHEETS-SHEET 3.

- -maae eras PATENT ora ion.

HARRY J DAHL, F PHILADELIPHIA, PENNSYLVANIA, ASSIGNOR'TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CQRPORATION OF ILLINOIS.

' ovnnsEAMIne-MAonmE.

Specification of Letters Patent. I

Patented May 29, ram.

Application filed October 6, 1910. Serial No. 585,611

To all whom it may concern:

Be-it known that I, HARRY J. DAHL, a. citizen of the United States, residing at Philadelphia, in the county of Philadelphla, State of Pennsylvania, have invented certain new and useful Improvements in Overseaming-Machines, of which the fol- 4 lowing is a description, reference being had to the accompanying drawing and to the thereon.

r of the material.

letters and figures of reference marked The invention relates to new and useful improvements in sewing machines, and

more especially to overseaming machines wherein stitches are formed around the edge In. forming an overedge seam, especially where the material is cut so as to leave a raw edge, it'is. found necessary to cause the needleto enter the material at some distance from theraw edge of the material in order to' provide proper anchorage for the threads. p

I have, found that by turning over the .edge of the material and causing the overseaming, stitches toinclose or'encircle said folded edge, I am able to produce an overseam which. may be made very much narrower than the ordinary over'seam and which overseam will be greatly strengthened by the folded edge of the material.

An object of the presentinvention, is to, provide an overseaming machine with means for folding the edge of the material and inclosing said folded edge by overseaming stitches. g I,

A further object of the invention, is to provide means for trimming the raw edge of a material, and means for folding said trimmed edge on to the body of the material, and means forfo'rming overseaming stitches around said folded edge.

I'have also found it desirable in some instances to feed a tape on to the upper face,

of the material, so that said tape will be partly inelosed by the overseaming stitches and the folded edges of the material, and a' further object of the invention is toprovide means for feeding a tape in advance of the stitching mechanism,'so that said tape may be partially inelosed in the overseam.

These and other objects will in part be -obvious, andwil'l in part be hereinafter more fully described.

In the drawings which show by way of end of a machine embodying myimprovements.

2 is a top plan view of the work sup- 7 port, and a portion of the mechanism adjacent,thereto.

Fig. 3 is a side view showing the trimmer blade,'the edge of the work support and the press'er foot. Fig. 4: is a perspective view of the throat plate, also showing the lower. trimming blade.

Fig. 5 is a sectional View on theline 00-01;. of Fig. 4.

Fig. 6 is a sectional view through the throat plate in front of the folder on an enlarged scale, also showing the needle and loopers used in forming an overseam. f Fig. '7 is a top plan view of the presser oot.

Fig. 8 is a sectional view through an over-- seam formedon my machine.

Fig. 9 is a similar view showing the application of the tape.

I have shown my invention as applied to anoverseaming machine of the type illustrated in the Onderdonk Patent #962,974, granted June 28th, 1910. Said machine is provided with a bed plate 1 on which the material rests during the stitching operation. The overhanging arm 2, supports the :needle bar 3, which is vibratedin the usual way andcarries a needle 4 at its lower end.

Cooperating with the needle above the work support is a thread carrying looper 5 and cooperatingwith the needle below the work support is a thread carrying looper 6.. The

loopers 5 and 6 cooperate with each other so that the looper threads are joined at the By the adjusting of these tensiergs, the points of the interlocking of the needle and looper threads may be varied. I prefer however,

' to adjust-the tensions so that the'thread of thelooper 5, and the needle thread will be interlocked substantially at the needle punctures on the upper face of the material, and

so that the thread of the looper 6 and the needle thread will be interlocked on the lower face of the material, substantially at the needle puncture, and so also that the looper threads will interlock at the folded edge of the material, as shown in Figs. 8 and 9. It is obvious however, that this interlocking of the threads or that the char.- acter of the overseaming stitch. forming mechanism, may be varied without departing from the spirit .of my invention.

The machine is also provided with a lower trimming blade 7, which is supported by. a

bracket 8 carried by the work support. (10-, operating with the lower trimmer blade is an upper trimming blade 9 mounted on a. lever 10?. and operated in the manner fully described inv the patent granted to Lansing Onderdonk December 24th, "1912,, No. 1,048,204,;which also shows the manner of adjusting the trimming blades for varying the width of the cut edge which is overstitched. The throatplate l0iwhich is mounted on the work support, is pro.-' vided with the usual feed slots 11, through which operate the feed engaging surfaces 12,of the feed dog. The throat plate is'also provide with 'a needle throat 13, and a stitched finger 14 around which the stitches are formed in the well known manner in this type of machine. At a point adjacent the needle throat 13, I have provided a folder 15, whichasherein shown is formed inteupwardly and then laterally, gradually tagrally with tlie throat' plate and projects peringfrom its receiving end to its delivery end ad acent .the needle, so as to fold the edge of thematerial over on to the body of the material. The folder 15 is located so as- ..j, to extend substantially from a point in front of the needle throat, toa point slightly in rear thereof, so that the looper threadafter it is interlocked with the needle thread, will be laid over the folder 15 andsaid folder "will therefore, take the place ofthe stitch finger usually carried on the presser foot. The folder extends however, as above noted, slightly in front of the needle throat, so

thatthe material will be completely'folded as it passes from the delivery endfo'fz the, folder, and where the stitches are drawn down on to the folded edge.

, From the, above, it will be apparent that I have provided an overedge-stitch forming mechanism which is adapted to join and :cover edgesvof fabric sections. The'folderr holds both of the trimmed edges and presents the same to the stitching mechanism, so that said folded'edges willbe-encirc'led by the over'edge stitches.

" edges of the folded over parts lie'close to the lineof needle puncture, but do not extend beyond the same, so that the entire fold in-the fabric will be encircled or inclosedby said overedge stitching. In other words,

the edges of the fabric sections are folded J substantially to and within'the limits of the width of the overedge stitches.

I "In order-to assistin the folding of the 'The trimmed f tape guide 21.

fabric, I have formed the upperedge of the lower trimming blade, with asurface which inclines downwardlyfrom'the cutting point of the blade toward; the front of the machine, and also toward the line of feed, and this cutting point is slightly raised above the plane of the work support.

By this positioning and construction of the lower trimming blade, the edge being trimmed willbe slightly bent upwardly, and

a preliminary fold started so that as the material passes into the folder, it may be folded completely on to the body of the material in a very short distance of travel. I am-' able thereby, .to :locate the trimming mechanism in the usualposition relative to the stitching point, and locate the folder in the rear of'the trimming blade so that the folding action occurs upon the cut edge of the material. have shown herein the work support provided with the usual edge guide 16 for guiding the material to the trimming .mechanism.

The presser foot 17 is supported by the usual presser bar 18. Said presser foot is cut away on the side'thereof adjacent the stitching mechanism from a point in rear of the stitching mechanism, to a point in front'of thetrimming mechanism. An adjustable plate 19 is secured by means of a slot and screw connection 20 to the presser foot, and hasa downwardly projecting portion which is substantially. flush with the lower face of the foot, which downwardly I projecting portion engages the material at a pomt ad acent the trimming mechanism.

This plate may be adjustedtoward and from the trimming blade. It will be noted that the presser foot isfno't in any Way pro vided "with a stitch' forming tongue inasabove noted. 7

It is sometimes desirable to stitch into the overseam 'a strengthening Itape. In order that this tape may befolded with the edges of the material, I have provided a tape ""g-uid'e22-1 'inathe'Pforward part ofthe presser 'foot'which is so disposed as to guide a tape with one'edge thereof passing close tothe trimming blades, and through the folder, so

much as the folder secures this function as.

shown and'described my in seaming machine, it is obvious that one of the essential features of the machine is the throat 'plate on which is formed the upwhich the stitches are laid. From certain aspects therefore, part of the present invention resides in the throat plate per 86.

,The trimmer is adjustable laterally in the manner shown and described in the patent above referred to. By adjusting the trim- Ining mechanism relative to the stitching mechanism and folder, I may vary the amount of material being folded.

It is obvious that minor changes in the details of\ construction may be made without departing from the spirit of my invention. 7

Having thus particularly described my invention, what I-claim as new and desire to secure by Letters. Patent, is

1. A sewing machine including in combination, feeding mechanism, overedge stitch forming mechanism for joining and covering the'edges of fabric sections, a trimming mechanism including trimming blades lo- 1 cated in advance of the overedge stitch forming mechanism, a folder in rear of the trimmingblades, said folder extending across the edges of the fabric sections and onto one face of said sections, whereby the edges of said fabric sections are folded .within the limits of the width of the'overedge stitches, said folder beingiso positioned relative to the overedge stitch forming mechanism that the stitches are laid over said folder and are fed off from thesame onto the folded "edges of the material.

2. -A sewing machine includingin combination, feeding mechanism, overedge stitch nation, feeding mechanism, overedge forming mechanism for joining and covering the edges of fabric sections, a trimm ng,

forming mechanism for joining and covermg the edges of fabric sections, a trinrnnng mechanism including trimmlng blades 10- cated in advance of the overedge stitch forming mechanism, a folder in rearof the trimming blade, said folder extending across the edges of the fabric sections and onto one face of said sections, whereby the edges of said fabric sections are folded within the limits of the width of the overedge stitches, and a tape guide for guiding a tape to said folder, whereby said tape is partly inclosed by said folded edges of the fabric sections 3. A sewing machine including in combimechanism including trimming blades located in advance of the overedge stitch forming mechanism, a folder in rearof the trimming blades, said folder extending across the edges of the fabric sections and onto one Y face of said sections, whereby the edges of said fabric sections are folded substantially to within the limits of the width of the overedge stitches, said folder'being so posi- .overedge stitching mechanism, a folder for folding an edge of a material, and over i which the stitches are laid, trimming mechanism in front of said folder for trimming the edge of the material before it is folded, said trimming mechanism including a' lower trimmer blade having its cutting edge ex tending above the work support, said blade being tapered from its cutting point downwardly toward the work support, and also downwardly toward the front of the machine, whereby the edge of the material being trimmed is given a preliminary bend as it enters the folder.

5. A sewing machine including in combination, overedge stitch forming mechanism for joining and covering the edges of fabric sections, a presser foot, a trimming mechanism including trimming blades located in advance of the overedge vstitch forming mechanism, a throatplate, a folder mounted -on said throat plate and located in rear of the trimming blades, said folder extending above and overlying the trimmed edges of the fabric sections for folding said edges substantially to and within the limits of the overedge stitches, said presser foot having a cut out portion for said folder, a stitch finger carried by said folder and extending rearwardly therefrom, said folder being so disposed relative to said overedge stitch forming mechanism that the stitches are laid over the folder and are fed off from said "folder on to the stitch finger and the folded edges of the fabric sections. 7

inc

6. A throat plate for sewing machines having-a stitch finger and a folder formed integral therewith, said folder being disposed in advance of the stitch finger and projecting upwardly and over the throat plate, whereby an edge of fabric may be folded so as to be covered by overedge stitches made around said stitch finger. '3'. A sewing machine including in combination, feeding mechanism,-

overedge stitch-formlng mechanism, -a

trimming mechanism including trimming blades 10- cated in advance of the stitching-mechanism, a folder locatedin rear of the trim ming mechanism and having a member extending above and over the edge of the material for folding the cut edge of the material to and within the limits of the overedge stitches, said folder being disposedadjacent,

the stitch-forming mechanism, whereby the stitches are led over said folder and fed off from the folder on-to'the folded edge of the material; and a presser foot having a fabric-engagingsurface extending to a point in advance of the trimming mechanism and to a point in rear of the stitching mechanism, said presser foot being recessed ononeside to receive the trimmer and -the folder. a

8. -A sewing machine including in com bination, feeding .mechanism, overedge stitcheforming mechanism, a trimming mechanism including trimming blades 10- catedin advance of. the stitching mecha-- and fed ofi from the folder on to the folded edge of the material, a presser foot having a fabric-engaging surface extending to a pointin advance of the trimming mechanism and to a point in rear of the stitching mechanism, said presser foot being recessed on one side to receive the trimmer and the folder,; and a feed dog cooperating with stitch finger for receiving and turning theedge of a fabric section and. for simultaneously supporting the overedge stitches.

In" testimany whereof I afiix my'signature, in presence of two Witnesses.

HARRY J. DAHL. lVitnesses: .C; H. Cnownnn' 1 Jos. H. MAsLANn. 

